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Home / Guitar Electronic Accessories / 20-12mm Plastic Knob for Tube Amplifier Potentiometer Switch Cap, Guitar Volume Control Round Knob

Attributes

Brand -
Category Musical Instrument Accessories / Guitar Electronic Accessories
Origin -
Material High-Impact ABS Plastic
Outer Diameter 20 mm
Total Height 12 mm
Shaft Fitment 6.35 mm (1/4 inch)
Color Matte Black
Shape Style Round Dome
Item Weight 4 grams per unit
Package Quantity 2 Pieces
Surface Finish Non-Slip Texture
Compatibility Standard Potentiometers

5 reviews

A

Anonymous

Mar 13, 2026

Rating: 5/5

Exactly as described

These knobs fit my Marshall clone perfectly. The plastic feels solid and not cheap. Happy with the purchase.

A

Anonymous

Feb 21, 2026

Rating: 5/5

Sturdy enough

I was worried plastic would break easily, but they feel robust. Good grip for volume swells.

A

Anonymous

Feb 17, 2026

Rating: 4/5

Good value

Nice knobs for the price. One was slightly tighter than the other, but both work fine on my potentiometers.

A

Anonymous

Feb 13, 2026

Rating: 5/5

Great replacement

Lost a knob on my old pedal board. These matched the height and width perfectly. Easy to push on.

A

Anonymous

Feb 04, 2026

Rating: 5/5

Classic look

Love the round style. Looks vintage on my custom build. Shipping was fast too.

5 FAQ

Q: Will this fit a 6mm solid shaft?

A: These are designed for standard 6.35mm (1/4 inch) shafts. 6mm might be too loose.

Q: Are these sold individually?

A: No, the package includes 2 knobs per order.

Q: Do you have these in white?

A: Currently, we only stock the Matte Black version for this model.

Q: Can these handle high heat from tube amps?

A: They are standard plastic. Please ensure they are not touching hot tubes directly.

Q: Is there a set screw included?

A: No, these are push-on friction fit knobs without set screws.

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